Adjusting the state Schedule message to improve implementation.

 * Changed body_bytes to original_create_transaction
   * Changed type to TransactionBody
 * Updated comments to clarify several items and correct language

Signed-off-by: Joseph Sinclair <joseph.sinclair@swirldslabs.com>

services/state/schedule/schedule.proto

@@ -25,13 +25,14 @@ package proto;
 import "basic_types.proto";
 import "timestamp.proto";
 import "schedulable_transaction_body.proto";
+import "transaction_body.proto";
 
 option java_package = "com.hederahashgraph.api.proto.java";
 // <<<pbj.java_package = "com.hedera.hapi.node.state.schedule">>> This comment is special code for setting PBJ Compiler java package
 option java_multiple_files = true;
 
 /**
- * First-draft representation of a Hedera Schedule Service in the network Merkle tree.
+ * Representation of a Hedera Schedule entry in the network Merkle tree.
  *
  * As with all network entities, a schedule has a unique entity number, which is usually given along
  * with the network's shard and realm in the form of a shard.realm.number id.
@@ -40,11 +41,13 @@ message Schedule {
 
     /**
      * The schedule deleted flag
+     * A schedule will either be executed or deleted, but never both.
      */
     bool deleted = 1;
 
     /**
      * The schedule executed flag
+     * A schedule will either be executed or deleted, but never both.
      */
     bool executed = 2;
 
@@ -54,54 +57,64 @@ message Schedule {
     string memo = 3;
 
     /**
-     * This schedule's unique ID within the network state.
+     * This schedule's unique ID within the global network state.
      */
     ScheduleID id = 4;
 
     /**
-     * The schedule account for this schedule.
+     * The schedule account for this schedule.  This is the account that submitted the original
+     * ScheduleCreate transaction.
      */
     AccountID scheduler_account = 5;
 
     /**
-     * The payer account for this schedule.
+     * The explicit payer account for the scheduled transaction.
+     * This account is added to the accounts that must sign the schedule before it will execute.
      */
     AccountID payer_account = 6;
 
     /**
-      * The admin key for this schedule.
+     * The admin key for this schedule.
+     * If this is not set, then the schedule cannot be deleted.
      */
     Key admin_key = 7;
 
     /**
-      * The start time of the schedule.
+     * The transaction valid start value from the transaction that created this schedule.
      */
     Timestamp schedule_valid_start = 8;
 
     /**
-      * The expiration time of the schedule as provided by the user.
+     * The requested expiration time of the schedule as provided by the user.
+     * The actual calculated expiration time may be "earlier" than this, but will not be later.
      */
     Timestamp expiration_time_provided = 9;
 
     /**
-      * The calculated expiration time of the schedule.
+     * The calculated expiration time of the schedule.  This is calculated based on the requested
+     * expiration time from the create transaction, and the maximum expiration permitted by the
+     * network.
+     * The schedule will be removed from global network state after the network reaches a consensus
+     * time greater than or equal to this value.
      */
     Timestamp calculated_expiration_time = 10;
 
     /**
-      * The consensus timestamp of the transaction that executed, deleted, or expired this schedule.
+     * The consensus timestamp of the transaction that executed or deleted this schedule.
      */
     Timestamp resolution_time = 11;
 
     /**
-     * The scheduled transaction
+     * The scheduled transaction to execute.
      */
     SchedulableTransactionBody scheduled_transaction = 12;
 
     /**
-     * The transaction body bytes
+     * The full transaction that created this schedule.  This is primarily used for duplicate
+     * schedule create detection.  This is also the source of the parent transaction ID, from
+     * which the child transaction ID is derived.
      */
-    bytes body_bytes = 13;
+    TransactionBody original_create_transaction = 13;
 
     /**
      * All the primitive keys that have already signed this schedule.